Questions tagged [igmp]
For questions about IGMP (Internet Group Management Protocol), a protocol used for communications between IPv4 hosts and multicast routers to establish and maintain host multicast group membership.
55
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IGMP backward compatibility
In RFC 2236 (IGMPv2), it is written
"An IGMPv2 host may be placed on a subnet where the Querier router has
not yet been upgraded to IGMPv2. The following requirements apply:
The IGMPv1 router ...
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0
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82
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Nonsense RFC 4604 forbids IGMP General Queries in SSM range but IGMP General Queries have no range and are send to 224.0.0.1, the all-systems address?
RFC 4604 Using Internet Group Management Protocol Version 3 (IGMPv3) and Multicast Listener Discovery Protocol Version 2 (MLDv2) for Source-Specific Multicast:
2.2.3. IGMPv1 Queries, IGMPv2 and MLDv1 ...
1
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1
answer
35
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Is there an IGMPv1 querier router after all?
I recently looked into the mechanics of IGMPv1 and v2. Reading RFC 1112, I understand that in IGMPv1, the Querier Router functionality does not exist. All IGMP configured routers in a local network ...
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1
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362
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IGMP in multiple switches with multiple Senders and Receivers in same VLAN
I am trying to send multicast traffic from 3 Senders to corresponding Receivers in same VLAN (100) spread across 3 switches.
I setup a Querier in one of the switch, but it doesn't seem to forward ...
- 63
2
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2
answers
492
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Query regarding IGMP Querier Election Process
I wanted to understand how a querier election takes place.
Say we have to L3 devices with ip address 10.1.1.2 and 10.1.1.1.
PIM is not enabled anywhere.
I checked around and found that the flow would ...
- 49
0
votes
1
answer
241
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PIM-SM over OSPF for mDNS traffic
I have connected 2 Routers via OSPF (using N links, N == 1 but it should be scalable to N > 2) and I am trying to have mDNS traffic go from LAN to LAN across the OSPF link, but I can't seem to make ...
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0
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78
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Does multicast over tunnels (e.g., GRE) require IGMP/MLD?
When subscribing to a multicast group on a tunnel device such as a GRE tunnel, are you supposed to participate in IGMP/MLD over that tunnel in order to announce your membership in the multicast group? ...
- 327
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0
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351
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Multicast traffic through Cisco3850
I have a test scenario and trying to pass multicast traffic through Cisco 3850 according to the following diagram:
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1
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212
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What prevents a device from receiving its own multicast stream, and can it be turned off?
I know that it is normally not possible for a device to receive its own multicast stream on the same network interface where it transmitted said stream. I also understand why this is sensible, and ...
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1
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266
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In an IGMP V2 membership report message, isn't the destination Ethernet address based on the multicast group IP address?
Specifically, I think for this message type the Ethernet destination address always starts with 01:00:5E, followed by the second byte of the IP address masked with 0x7F, followed by the third and ...
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0
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432
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IGMP Snooping issue. probably
I have multicast hosts that keep leaving a group, only to join back up which results in loss of video feeds.
The network consists of a variety of Cisco 2960's and a Cisco 9300 w/ PIM Sparse mode set ...
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1
answer
1k
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How to enable Inter-VLAN multicast traffic on a layer 3 Siemens RX1510 Network Switch using IGMP?
I have a single Layer 3 Siemens RX1510 network switch split into 4 separate VLANs on different subsets.
Name | Gateway | Subnet
VLAN1 | 198.97.100.123 | 255.255.255.0
VLAN2 |...
- 101
2
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2
answers
300
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Trying to understand IGMPv3 Max Response Code algorithm
In IGMPv2, the Max response time is an 8-bit value each unit encoding 0.1 seconds. The typical max response time is 100 resulting in a 10 second max response time.
In IGMPv3, if the Max response code ...
- 2,183
2
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1
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113
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How can MLDv2 work according to the RFCs 3810 and 4606?
When IPv6 Stateless Address Autoconfiguration is happening, an interface/node has to join the all-nodes multicast address and the solicited-node multicast address AFTER forming a "tentative" ...
- 151
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1
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757
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Multicast in one VLAN
I need to receive multicast traffic over L2 segment on my client machine. But for some reason I am unable to do it.
To my understanding with such scheme I should receive traffic if inbetween Juniper ...
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0
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408
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To multicast or not to multicast over LTE? [closed]
I have an IOT device with static IP connected to a Mikrotik LTE device on ether1. The IOT host sends a multicast packet every second. The packet contains the IP and MAC of the host.
IP-Multicast: ...
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2
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1
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243
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IGMP leave group
Would like to have some clarification on following scenario:
There is Linux platform with an Ethernet interface which has some constant default IP address (eth0: 10.0.0.1) and some changing IP ...
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7
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3
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8k
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OSPF and its use of Multicast
When it comes to OSPF and its use of multicast, am I correct in believing that IGMP forwarding and an IGMP querier is still required within the local segment?
My understanding would be without this, ...
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1
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1
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419
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Understanding IP multicast in linux [closed]
My ultimate goal is to setup IGMP snooping on a linux machine using netfilter hooks. This is for exploratory purposes to understand IGMP protocol.
The topology we are using is as follows:
| ...
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3
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1
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Using IGMP but Multicast still Flooding
Im new here.
I want to ask about the multicast,
The first case is, I have switch HP 2530 24 port with 24 10/100 and 2 100/1000 NIC, And i have servers with bandwidth video multicast around 120-...
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3
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1
answer
3k
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Multicast flooding network ProCurve Switch 2520G
Switch: ProCurve Switch 2520G-8-PoE
Scenario: Multicast is flooded onto the network
Having multicast flooded makes it so TV is stuttering and pixelating. I do on my ProCurve have IGMP and Querier ...
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4
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3
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1k
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Multicast routing on Huawei Quidway 5300 Switches
I have been testing a scenario which involves multicast routing for multicast traffic the scenario is pretty simple.
I have two L3 switches with OSPF running in between them, two computers are ...
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2
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2
answers
7k
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Aruba 2530 - IGMP Enabled, Querier on still no filtering
I have a in port 1 - 5 channels of multicast. On port 2 i have a computer. Both are in VLAN 10 untagged and a more bigger network tagged on port 3.
I've enabled IGMP with: config, vlan 10, ip igmp, ...
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3
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2
answers
5k
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IGMP and multicast forwarding
So my question is, will using IGMP alone(without IGMP snooping, PIM...etc) making router forwarding multicast traffic?
I'm working on a buggy switch, but I don't know about networking too, so I'm ...
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4
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0
answers
434
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STB generate IGMP Leave without reason
In my network STB generates IGMP Leave (in STB logs "End of Stream") without any reason or there is something what I don't understand.
There is one exeption STB directly connected to PIM (ASR920) ...
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3
votes
2
answers
10k
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Multicast between VLANs
I've following scenario
Upper computer on VLAN 10 is sending some multicast messages and lower computer on VLAN 10 sends IGMP join periodically.
Lets say MC address is 224.1.1.1
Now, computer on ...
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5
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0
answers
294
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ASR920 - port Te0/0/3-tefp1 is not a router port on Vlan 217
When I enabled debugging:
PIM#debug ip igmp snooping router
I get in logs:
Mar 30 15:58:36.275: IGMPSN: router: port Te0/0/3-tefp1 is not a router port on Vlan 217
Configuration for interfaces:
...
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2
votes
1
answer
75
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Should igmp table lookup misses flood to all ports?
With igmp snooping, upon receiving a multicast packet it looks up the table and decides which ports to forward the packet. What I'm wondering is, if there is not an entry in the table for that ...
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1
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1
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206
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Question Regarding IGMPv3 behaviour: Multicast Router appears to send Membership Report?
I'm new to how IGMP works. Recently, I was looking at a packet capture:
I see that 172.18.1.3 sends a membership query to the all hosts address, leading me to assume that 172.18.1.3 is a multicast ...
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3
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2
answers
2k
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Rationale for EXCLUDE mode in mutlicast IGMPv3 / MLDv2
Both IGMPv3 and MLDv2 have an include and an exclude mode, where a multicast listener can specify to either listen only for packets from some list of source addresses (include) or only for packets ...
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2
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1
answer
2k
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IGMP snooping across VLANs
Set up:
Core switch: C1
C1 is an L3 switch--there is no router
Access switches: A1, A2, A3
VLANs: V1, V2
Hosts: H11, H12, H13, H21, H22, etc.
Connections:
C1 connects to A1, A2, A3
A1, A2, A3 each ...
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3
answers
2k
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Minimum possible size of Ethernet/IGMP frames
I am writing an application that needs to ignore frames whose size is smaller than the minimum possible size of Ethernet/IGMP frames. I have researched extensively and found the following information:
...
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2
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1
answer
927
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Unable to route multicast from IPcam (four vlans, one switch, one router with router-on-a-stick)
Okay, so I've been searching far and wide for a solution to my problem here.
I want to be able to access an IPcam through its respective software across VLANs.
Hardware: Cisco 1841 Router, firmware ...
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4
votes
1
answer
2k
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Multicast timer expires
I've a multicast network for security cameras (multiple RPs, bsr, connectivity with OSPF).
The problem is that the monitors sometimes stop receiving the video stream.
(10.0.0.1, 234.0.0.1), 00:10:11/...
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0
answers
3k
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Regarding vPC Dual Active or Split Brain scenario
Consider the below topology:
Imagine that both the vPC peer keepalive link and vPC peer link have gone down.
I am trying to understand how will that lead to unpredictable traffic flows or loops.
...
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4
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1
answer
1k
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Multiple VLANs under one subnet (for traffic control)
Looking at a fiber ring network of 11 switches on the same subnet, with 3 types of devices per module (device 1, 2 & 3).
control room switch 192.168.11.100
module 1 ethernet switch 192....
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1
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1
answer
489
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Cisco 4948 - multicast routing
Could anyone help me with Cisco 4948 config?
I have to route multicast traffic from one Vlan to another. Multicast source and multicast destination are IGMP-enabled devices, there are no PIM-devices ...
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3
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2
answers
958
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How do you disable IGMP-snooping on virtual nic macvtap
Networking community,
Question:
How do you disable IGMP-snooping on virtual nic macvtap?
Background:
We have noticed that Juniper vSRX 15.1X49-D60 (Running on Ubuntu 16.04LTS Server KVM) is ...
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1
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1
answer
587
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IGMP and Multicast
I have 3 hosts (h1, h2, h3) on my LAN segment and a router with IGMP enabled.
Now the host h3 wants to join the multicast group (239.0.0.2 say)
Host h3 will send a membership report to 239.0.0.2
(...
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5
votes
3
answers
15k
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Inter-switch IGMP on a VLAN with two switches, and a multicast source per switch
I have a network consisting of two HP 2810 switched. Attached to each switch is, on one port, a multicast video coder, and on a different port, a decoder.
There are two VLANs - a control VLAN (...
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0
answers
2k
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How do switches behave on multicast? [closed]
I am benchmarking multicast throughput of my LAN using an application that considers all the servers as group members.
The network consists of homogeneous servers (S0-S9: 192.168.21.70-79) inter-...
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1
vote
2
answers
120
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Multicasting - How to send a hint to the router?
I found a multicasting example at http://ntrg.cs.tcd.ie/undergrad/4ba2/multicast/antony/example.html. After correcting some errors, this program seems to work fine within our network.
I now need to ...
Peter
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2
answers
1k
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IGMP Query Interval
What adverse effects could occurred if I set the igmp snooping querier query-interval to 1 second in the switch?
The default in switch is 60 seconds
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0
answers
1k
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Cisco SG300 switch identifies itself as duplicate IP address
We've enabled IGMP snooping on one of our VLANs. The configuration used is:
bridge multicast filtering
ip igmp snooping
ip igmp snooping vlan 1
ip igmp snooping vlan 1 querier
We're now seeing the ...
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2
votes
2
answers
999
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Multicasting questions
Ok,
Basic question is this.
show ip igmp snooping groups
Is not returning the multicast groups I am creating
More in-depth explanation.
I want to test multicast. I am on a flat network, and I ...
29
votes
1
answer
101k
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What are the benefits and cons of IGMP snooping?
Our new router is asking if we want IGMP snooping enabled. Not being familiar with this, I looked to the internet and got the following wiki description:
IGMP snooping is the process of listening ...
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6
votes
2
answers
1k
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IGMP Multicast router overrun
THE SYSTEM:
I have a L2 Managed 1Gbps switch with IGMP snooping (the switch I'm testing with is a TP-Link TL-SG3216). I have several identical devices (these are embedded devices that we are ...
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1
vote
1
answer
551
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Is it possible to use group multicast (IGMP) over the internet?
I am looking at building an application that broadcasts audio using my own proprietary protocol. Under the covers I'd prefer to use IGMP or something where 1000 clients don't use 1000 times the ...
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2
votes
0
answers
284
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Don't receive multicast traffic [closed]
I'm using multicast communications with IGMP snooping enable in the switch, I have 6 nodes (A, B, C, D, E, F), 3 sends data to different Multicast address and 3 receive data from every multicast ...
- 21
5
votes
3
answers
726
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Multicast Distribution with PIM
I have to receive some multicast groups for an IPTV platform. I can't use PIM (they don't give me an RP address for the groups...). The provider suggested me to do a join to each multicast group and ...
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